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Apple Cinema Display 30" compatible with Radeon VII and Razer core X ?
 

Apple Cinema Display 30" compatible with Radeon VII and Razer core X ?  

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maeda
(@maeda)
New Member
Joined: 4 months ago
 

Hello,

Is it possible to connect an old 30" apple Cinema Display to a Razer Core X
The GPU will be a Radeon VII.

Thank you !

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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 3 years ago
 

I believe that particular screen is fed by a Dual-Link DVI, which means that you can get it to work by using a DisplayPort to DVI adapter.

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joevt
(@joevt)
Honorable Member
Joined: 2 years ago
 

The adapter to use must be a DisplayPort to Dual Link DVI adapter if you want the full 2560x1600 60Hz resolution. Dual Link DVI adapters usually have a USB connector for extra power required for the conversion. And they are more expensive than single link DVI adapters.

A single link DVI adapter (or HDMI adapter) does not require USB power but will allow the display to work only at 1280x800 60Hz.

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maeda
(@maeda)
New Member
Joined: 4 months ago
 

Hey !

You're right joevt. 
I just connect the display to the Razer core X and the maximum resolution is 1280x800.
Apparently i need the Dual link DVI adapter.

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joevt
(@joevt)
Honorable Member
Joined: 2 years ago
 

One interesting fact about the 1280x800 timing mode is that the display scales it up to 2560x1600 by quadrupling the pixels (all four pixels are identical). This is different than using a scaled 1280x800 resolution where the graphics card scales it up for a 2560x1600 timing mode using a smoothing technique where part of a pixel's color depends on its neighbors. Maybe it's using bicubic interpolation? More likely bilinear interpolation?

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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 3 years ago
 

Something I remembered: If you can set custom resolutions and timings, you can drive 2560x1600 out of a single-link DVI or a regular HDMI cable at sub-60hz. I did that for a while with a Dell 3008WFP connected to an old laptop that only had a HDMI port for output. I managed to get it working at 2560x1600 at 36hz (or was it 34hz, I don't recall). Not ideal, but not too bad if you don't game on it. This was on Win10, not sure if OS X supports the same customization of output or not.

Want to output [email protected] out of an old system on the cheap? Read here.
Give your Node Pro a second Thunderbolt3 controller for reliable peripherals by re-using a TB3 dock (~50$).

"Always listen to experts. They'll tell you what can't be done, and why. Then do it."- Robert A. Heinlein, "Time Enough for Love."


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maeda
(@maeda)
New Member
Joined: 4 months ago
 

I noticed that the Dual Link DVI adapter is not anymore sold by Apple. 
Hopefully my neighbors still got one ! (they work in postproduction) 
With the adapter everything works perfectly and there is no problem to use the 30".

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maeda
(@maeda)
New Member
Joined: 4 months ago
 
Posted by: Yukikaze

Something I remembered: If you can set custom resolutions and timings, you can drive 2560x1600 out of a single-link DVI or a regular HDMI cable at sub-60hz. I did that for a while with a Dell 3008WFP connected to an old laptop that only had a HDMI port for output. I managed to get it working at 2560x1600 at 36hz (or was it 34hz, I don't recall). Not ideal, but not too bad if you don't game on it. This was on Win10, not sure if OS X supports the same customization of output or not.

Maybe i'm wrong but in Mac OS X you can't change the timings.

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joevt
(@joevt)
Honorable Member
Joined: 2 years ago
 

Other companies make DisplayPort to Dual Link DVI Adapters. They are $145 or more.
StarTech.com DP2DVID2 DisplayPort to DVI Dual Link Active Adapter Converter - DP to Dual Link DVI-D Active Adapter - 2560x1600
Accell B087B-002B DisplayPort to DVI Dual-Link Adapter
Tripp Lite 6" Mini DisplayPort to DVI-D Adapter Dual Link Active MDP to DVI (P137-06N-DVI-DL)
I've only tried the startech one.

Use SwitchResX to add timings and scaled modes. Get the info for the 1280x800 timing from the EDID if you want to try it instead of the scaled mode.

Single Link DVI usually tops out at 165 MHz. Dual Link DVI doubles that to 330 MHz. Sometimes a DVI port is actually a HDMI 1.4 port with a max of 340 MHz. You cannot use that to drive a dual link DVI display at 2560x1600 60Hz unless you use a HDMI 1.4 to DisplayPort adapter with a DisplayPort to Dual Link DVI adapter.

The Apple 30" Cinema display is kind of dumb - it only supports two timing modes: 1280x800 60Hz (single link) and 2560x1600 60Hz (dual link). Scaled modes are used for every other resolution.

There is an adapter that can be used to convert Dual Link DVI to DisplayPort which is useful for old graphics cards that don't have DisplayPort.
Gefen GTV-DVIDL-2-MDP Dual Link DVI to Mini DP Converter

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